package com.teamin.security;

import javax.crypto.*;
import javax.crypto.spec.SecretKeySpec;
import java.io.UnsupportedEncodingException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;

/**
 * @author fuqiang 2015-5-4
 *
 */
public class AESUtils {
	/**
	 * 加密
	 * 
	 * @param content
	 *            需要加密的内容
	 * @param password
	 *            加密密码
	 * @return
	 */
	public static String encrypt(String content, String password) {
		// System.out.println("encrypt = "+content+" password = "+password);
		try {
			// KeyGenerator kgen = KeyGenerator.getInstance("AES");
			// kgen.init(128, new SecureRandom(password.getBytes()));
			// SecretKey secretKey = kgen.generateKey();
			SecretKey secretKey = getKey(password);
			byte[] enCodeFormat = secretKey.getEncoded();
			SecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES");
			Cipher cipher = Cipher.getInstance("AES");// 创建密码器
			byte[] byteContent = content.getBytes("utf-8");
			cipher.init(Cipher.ENCRYPT_MODE, key);// 初始化
			byte[] result = cipher.doFinal(byteContent);
			return parseByte2HexStr(result);
		} catch (NoSuchAlgorithmException e) {
			e.printStackTrace();
		} catch (NoSuchPaddingException e) {
			e.printStackTrace();
		} catch (InvalidKeyException e) {
			e.printStackTrace();
		} catch (UnsupportedEncodingException e) {
			e.printStackTrace();
		} catch (IllegalBlockSizeException e) {
			e.printStackTrace();
		} catch (BadPaddingException e) {
			e.printStackTrace();
		}
		return null;
	}

	/**
	 * 因为linux与windows的加密问题
	 * 
	 * @param strKey
	 * @return
	 */
	public static SecretKey getKey(String strKey) {
		try {
			KeyGenerator _generator = KeyGenerator.getInstance("AES");
			SecureRandom secureRandom = SecureRandom.getInstance("SHA1PRNG");
			secureRandom.setSeed(strKey.getBytes());
			_generator.init(128, secureRandom);
			return _generator.generateKey();
		} catch (Exception e) {
			throw new RuntimeException(" 初始化密钥出现异常 ");
		}
	}

	/**
	 * 解密
	 * 
	 * @param content
	 *            待解密内容
	 * @param password
	 *            解密密钥
	 * @return
	 */
	public static String decrypt(String descryptContetn, String password) {
		// System.out.println("decrypt = "+descryptContetn+" password =
		// "+password);
		try {
			byte[] content = parseHexStr2Byte(descryptContetn);
			// KeyGenerator kgen = KeyGenerator.getInstance("AES");
			// kgen.init(128, new SecureRandom(password.getBytes()));
			// SecretKey secretKey = kgen.generateKey();
			SecretKey secretKey = getKey(password);
			byte[] enCodeFormat = secretKey.getEncoded();
			SecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES");
			Cipher cipher = Cipher.getInstance("AES");// 创建密码器
			cipher.init(Cipher.DECRYPT_MODE, key);// 初始化
			byte[] result = cipher.doFinal(content);
			return new String(result);
			// return result; // 加密
		} catch (NoSuchAlgorithmException e) {
			e.printStackTrace();
		} catch (NoSuchPaddingException e) {
			e.printStackTrace();
		} catch (InvalidKeyException e) {
			e.printStackTrace();
		} catch (IllegalBlockSizeException e) {
			e.printStackTrace();
		} catch (BadPaddingException e) {
			e.printStackTrace();
		}
		return null;
	}

	/**
	 * 将二进制转换成16进制
	 * 
	 * @param buf
	 * @return
	 */
	public static String parseByte2HexStr(byte buf[]) {
		StringBuffer sb = new StringBuffer();
		for (int i = 0; i < buf.length; i++) {
			String hex = Integer.toHexString(buf[i] & 0xFF);
			if (hex.length() == 1) {
				hex = '0' + hex;
			}
			sb.append(hex.toUpperCase());
		}
		return sb.toString();
	}

	/**
	 * 将16进制转换为二进制
	 * 
	 * @param hexStr
	 * @return
	 */
	public static byte[] parseHexStr2Byte(String hexStr) {
		if (hexStr.length() < 1)
			return null;
		byte[] result = new byte[hexStr.length() / 2];
		for (int i = 0; i < hexStr.length() / 2; i++) {
			int high = Integer.parseInt(hexStr.substring(i * 2, i * 2 + 1), 16);
			int low = Integer.parseInt(hexStr.substring(i * 2 + 1, i * 2 + 2), 16);
			result[i] = (byte) (high * 16 + low);
		}
		return result;
	}

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// String content =
		// "737A455145E810EDE735A02FBE62162AD06A2E466E30AAB1A775A07A57F2735D";
		// String password = "No money how to do";
		// 加密
		// .out.println("加密前：" + content);
		// String encryptResultStr = encrypt("a", "No money how to do");
		// System.out.println("加密后：" + encryptResultStr);
		// 解密
		
		String le = encrypt("type=3,method=verificationUser,addProjectId=,userEmail=nmmhdt4g@www.bccto.me,time=1449023911920", "No money how to do");
		System.out.println(le);
		System.out.println(le.length());
		System.out.println("解密后：" + decrypt("6464C8B877B233D520956917B7BCD45367C3ED85566DE503E73438C9B3767A9872C63687447AA1B17A52BEB8362BC8350D9FB9E011ADA6AA27238184EAA3201A4C795BF6A1D642CD83C618225E3007528D485C60621881BD072E51465E6FB6045CC314F59D81DD6B397E8DEDE35F024E", "No money how to do"));
	}

}